Balloon signal unit



FIG. 1 is a perspective view of a balloon signal unit.

FIG. 2 is a front cross-sectional view of the balloon signal unit, taken along line 2—2 of FIG. 1.

FIG. 3 is a front cross-sectional view of the balloon signal unit in the open position.

FIG. 4 is a right side elevational view of the balloon signal unit in the closed position.

FIG. 5 is a left side elevational view thereof.

FIG. 6 is a front elevational view thereof, the rear elevational view being a mirror image of the front view.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a balloon signal unit, as shown and described. 